A federal judge’s decision to block JetBlue Airways Corp.’s proposed $3.8 billion acquisition of Spirit Airlines Inc. is a good outcome for JetBlue, according to J.P. Morgan. “In our minds, this represents the cleanest possible outcome for equity holders; it frees JetBlue from a costly merger we believe management and the Board were no longer wed to (unless at a markedly reduced price, a complex scenario not easily achieved, in our view),” J.P. Morgan analyst Jamie Baker, wrote in a note released Tuesday. “ ...